No result with an ESP32 and a NHD-0420D3Z_A

[Mlebailly22]

Hi,

I try for now 3 days to see a beautiful "Hello World" pop up on my screen, but it didn't 😫

I work with an ESP32, and i want to work with I2C so i have the SDA and SCL connected, (Correctly because with an I2C Scanner i see my screen on the address 0x28).

But after that i have nothing that work,

For the moment your code is the one that match the best with my needs, but exempt the line :

initLCD_I2C(22, 21);
//initLCD_SPI(5, 4, 3);
//initLCD_RS232(2);

I don't know what i must change more.

Have you any idea why this doesn't magically work alone?

Thank's a lot for your help

ML

[CJoh-NHD]

Hi, Did you change the jumpers on the display board to I2C Mode? [A close-up of a list of information Description automatically generated] NHD-0420D3Z-FL-GBW-V3 and NHD-0420D3Z-NSW-BBW-V3 both need to have the R1 shorted and R2 open to work in I2C. [A green circuit board with black circles Description automatically generated] Regards, Mateusz Kaczowka | Engineering Intern Newhaven Display International, Inc. 2661 Galvin Court, Elgin, IL 60124 - USA Call: 847.844.8795 | Fax: 847.844.8796 www.newhavendisplay.com<https://www.newhavendisplay.com/> From: Mlebailly22 ***@***.***> Sent: Thursday, July 27, 2023 4:57 PM To: NewhavenDisplay/Serial-LCD ***@***.***> Cc: Subscribed ***@***.***> Subject: [NewhavenDisplay/Serial-LCD] No result with an ESP32 and a NHD-0420D3Z_A (Issue #1) Hi, I try for now 3 days to see a beautiful "Hello World" pop up on my screen, but it didn't 😫 I work with an ESP32, and i want to work with I2C so i have the SDA and SCL connected, (Correctly because with an I2C Scanner i see my screen on the address 0x28). But after that i have nothing that work, For the moment your code is the one that match the best with my needs, but exempt the line : initLCD_I2C(22, 21); //initLCD_SPI(5, 4, 3); //initLCD_RS232(2); I don't know what i must change more. Have you any idea why this doesn't magically work alone? Thank's a lot for your help ML — Reply to this email directly, view it on GitHub<#1>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AWNW5MGNHIFKG67RA3JMVKTXSLPZZANCNFSM6AAAAAA22VVJOU>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.******@***.***>>

[Mlebailly22]

Hi, Yes I Have ! And that work because my I2c Scanner see it. Thanks Envoyé à partir de Outlook pour Android<https://aka.ms/AAb9ysg>

…

________________________________ From: Cody Johnson ***@***.***> Sent: Friday, July 28, 2023 3:27:08 PM To: NewhavenDisplay/Serial-LCD ***@***.***> Cc: Mlebailly22 ***@***.***>; Author ***@***.***> Subject: Re: [NewhavenDisplay/Serial-LCD] No result with an ESP32 and a NHD-0420D3Z_A (Issue #1) Hi, Did you change the jumpers on the display board to I2C Mode? [A close-up of a list of information Description automatically generated] NHD-0420D3Z-FL-GBW-V3 and NHD-0420D3Z-NSW-BBW-V3 both need to have the R1 shorted and R2 open to work in I2C. [A green circuit board with black circles Description automatically generated] Regards, Mateusz Kaczowka | Engineering Intern Newhaven Display International, Inc. 2661 Galvin Court, Elgin, IL 60124 - USA Call: 847.844.8795 | Fax: 847.844.8796 www.newhavendisplay.com<https://www.newhavendisplay.com/> From: Mlebailly22 ***@***.***> Sent: Thursday, July 27, 2023 4:57 PM To: NewhavenDisplay/Serial-LCD ***@***.***> Cc: Subscribed ***@***.***> Subject: [NewhavenDisplay/Serial-LCD] No result with an ESP32 and a NHD-0420D3Z_A (Issue #1) Hi, I try for now 3 days to see a beautiful "Hello World" pop up on my screen, but it didn't 😫 I work with an ESP32, and i want to work with I2C so i have the SDA and SCL connected, (Correctly because with an I2C Scanner i see my screen on the address 0x28). But after that i have nothing that work, For the moment your code is the one that match the best with my needs, but exempt the line : initLCD_I2C(22, 21); //initLCD_SPI(5, 4, 3); //initLCD_RS232(2); I don't know what i must change more. Have you any idea why this doesn't magically work alone? Thank's a lot for your help ML — Reply to this email directly, view it on GitHub<#1>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AWNW5MGNHIFKG67RA3JMVKTXSLPZZANCNFSM6AAAAAA22VVJOU>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.******@***.***>> — Reply to this email directly, view it on GitHub<#1 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AMBWCD5PDF3BXAMYMEOCGCDXSO42ZANCNFSM6AAAAAA22VVJOU>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[CJoh-NHD]

Hello, Have you tried with the example initialization sequence for this display? (https://newhavendisplay.com/content/app_notes/Serial_LCD.txt) If you have and it still did not work, can you send me your entire code? Also can you tell me how you have everything wired up? Regards,

[Mlebailly22]

I'm afraid that your code is not for an ESP or an Arduino?

It's look like the C Source Code, but i don't know if that work with my ESP32?

this is my full code :
https://merio2019-my.sharepoint.com/:u:/g/personal/melvinlebailly_merio2019_onmicrosoft_com/EYtzVDeTc15JkvXnwcExywQBGhLvU8-G6PLLNC4U0tTlaQ?e=wnpGIe

And for the Wire, i connect like that :
NHD -> ESP32
J2-6 -> +5V
J2-5 -> GND
J2-4 -> GPIO21
J2-3 -> GPIO22

Thanks

[CJoh-NHD]

Hi, I tried your code on my end and noticed some issues. void loop() { setContrast(0); delay(1000); setContrast(100); delay(1000); setBrightness(0); delay(1000); setBrightness(100); delay(1000); } The value you have set here are invalid, contrast can only be between 1-50 and brightness can only be between 1-8 per the data sheet (https://newhavendisplay.com/content/specs/NHD-0420D3Z-FL-GBW-V3.pdf) page 11 Setting this (as well as setting the pins back to 5,4) allowed me to get the display working using an Arduino uno. void loop() { setContrast(1); delay(1000); setContrast(50); delay(1000); setBrightness(1); delay(1000); setBrightness(8); delay(1000); } If the code still does not run, then the most likely issue is that the ESP32 has different syntax then the UNO. Regards, Mateusz Kaczowka | Engineering Intern Newhaven Display International, Inc. 2661 Galvin Court, Elgin, IL 60124 - USA Call: 847.844.8795 | Fax: 847.844.8796 www.newhavendisplay.com<https://www.newhavendisplay.com/> From: Mlebailly22 ***@***.***> Sent: Friday, July 28, 2023 9:12 AM To: NewhavenDisplay/Serial-LCD ***@***.***> Cc: Cody Johnson ***@***.***>; Comment ***@***.***> Subject: Re: [NewhavenDisplay/Serial-LCD] No result with an ESP32 and a NHD-0420D3Z_A (Issue #1) I'm afraid that your code is not for an ESP or an Arduino? It's look like the C Source Code, but i don't know if that work with my ESP32? this is my full code : https://merio2019-my.sharepoint.com/:u:/g/personal/melvinlebailly_merio2019_onmicrosoft_com/EYtzVDeTc15JkvXnwcExywQBGhLvU8-G6PLLNC4U0tTlaQ?e=wnpGIe<url> And for the Wire, i connect like that : NHD -> ESP32 J2-6 -> +5V J2-5 -> GND J2-4 -> GPIO21 J2-3 -> GPIO22 Thanks — Reply to this email directly, view it on GitHub<#1 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AWNW5MHH5R267WDIFLEVOHLXSPCCRANCNFSM6AAAAAA22VVJOU>. You are receiving this because you commented.Message ID: ***@***.******@***.***>>

[Mlebailly22]

Hi,

I come back with some new try,

I have now an oscilloscope to help me seeing my I2C trame to see the problem.

Is there a way that i get a screenshot of the I2C trame that work for you?
To see the difference with mine?

To verify that my screen is correctly plug and configure, i try a new code a basic one, with the Wire.h library (to use I2C)

So I Write a code that just call My screen (and the address before and the address after) and if i get the ACK, send a command.

https://merio2019-my.sharepoint.com/:u:/g/personal/melvinlebailly_merio2019_onmicrosoft_com/Ed2TEUl_hlxJt3iYBgDUkygBVPXie9ZKUQ3VseUD8y6d2A?e=G25oDm

And there is the result :

We can see 3 try the first one the ACK is 1 because it's the wrong address, the second is Okay (ACK is 0) and the third is false, so with this try i consider that my screen is correctly answering. And correctly plug.

Then i write an other code that (i think but i'm not sure) send the prefix (0xFE) then the command to Turn Off the Screen (0x42) and turn on the Screen (0x41)

here the code : https://merio2019-my.sharepoint.com/:u:/g/personal/melvinlebailly_merio2019_onmicrosoft_com/EVNIzWUGr0dCq6N9k6V6vwkB9s07g_5CnG9CAM2SpJhLcg?e=tGqMLr

And here the result :

Send the 0x41 :

Send the 0x42 :

I don't know if you see anything that not right,

The main difference with your code that i see it's the baud rate that are 100kHz here, but according to your datasheet it's the max that your screen support.

Thank you very much for all your help and your time

ML

[NHD-TechSupport]

Hello,

We have reviewed your code and it seems to be fine. We are able to get it working with our Arduino Uno.

The issue is likely with the ESP32 MCU. ESP32 is a 3.3V logic board, and the display is 5V logic. You will need to switch to a 5V logic MCU, or implement a level shifter circuit to communicate with the display.

I also would suggest changing your I2C_DELAY definition back from 5 to 100. The shorter delay may affect the data transmission.

[Mlebailly22]

Oh yes okay thanks, I use other I2C devices and they always worked with 3.3v, but I will try to put a level shifter . Thanks you very much for the solution. And for the I2C_DELAY, Yes I already restore it to 100, it was a test to see if the speed communication was the problem but no. So thanks for all Have a really nice day Envoyé à partir de Outlook pour Android<https://aka.ms/AAb9ysg>

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________________________________ From: NHD Tech Support ***@***.***> Sent: Thursday, August 3, 2023 5:32:00 PM To: NewhavenDisplay/Serial-LCD ***@***.***> Cc: Mlebailly22 ***@***.***>; Author ***@***.***> Subject: Re: [NewhavenDisplay/Serial-LCD] No result with an ESP32 and a NHD-0420D3Z_A (Issue #1) Hello, We have reviewed your code and it seems to be fine. We are able to get it working with our Arduino Uno. The issue is likely with the ESP32 MCU. ESP32 is a 3.3V logic board, and the display is 5V logic. You will need to switch to a 5V logic MCU, or implement a level shifter circuit to communicate with the display. I also would suggest changing your I2C_DELAY definition back from 5 to 100. The shorter delay may affect the data transmission. — Reply to this email directly, view it on GitHub<#1 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AMBWCD4BA3M3AFQXX6M5B3TXTO77BANCNFSM6AAAAAA22VVJOU>. You are receiving this because you authored the thread.Message ID: ***@***.***>